Entity3DContainer.hpp

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/* 
 * Entity3DContainer.hpp 
 *
 * This file is part of the Chemical Data Processing Toolkit
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_CHEM_ENTITYCONTAINER_HPP
#define CDPL_CHEM_ENTITYCONTAINER_HPP
 
#include <cstddef>
 
#include "CDPL/Chem/APIPrefix.hpp"
#include "CDPL/Util/IndexedElementIterator.hpp"
 
 
namespace CDPL
{
 
    namespace Chem
    {
 
        class Entity3D;
 
        class CDPL_CHEM_API Entity3DContainer
        {
 
            class ConstEntityAccessor;
            class EntityAccessor;
 
          public:
            typedef Util::IndexedElementIterator<const Entity3D, ConstEntityAccessor> ConstEntityIterator;
 
            typedef Util::IndexedElementIterator<Entity3D, EntityAccessor> EntityIterator;
 
            virtual std::size_t getNumEntities() const = 0;
 
            virtual const Entity3D& getEntity(std::size_t idx) const = 0;
 
            virtual Entity3D& getEntity(std::size_t idx) = 0;
 
            ConstEntityIterator getEntitiesBegin() const;
 
            ConstEntityIterator getEntitiesEnd() const;
 
            EntityIterator getEntitiesBegin();
 
            EntityIterator getEntitiesEnd();
 
            ConstEntityIterator begin() const;
 
            ConstEntityIterator end() const;
 
            EntityIterator begin();
 
            EntityIterator end();
 
            const Entity3DContainer& getEntities() const
            {
                return *this;
            }
 
            Entity3DContainer& getEntities()
            {
                return *this;
            }
 
          protected:
            virtual ~Entity3DContainer() {}
 
            Entity3DContainer& operator=(const Entity3DContainer& cntnr);
 
          private:
            class CDPL_CHEM_API ConstEntityAccessor
            {
 
              public:
                ConstEntityAccessor(const EntityAccessor& accessor):
                    container(accessor.container) {}
 
                ConstEntityAccessor(const Entity3DContainer* cntnr):
                    container(cntnr) {}
 
                const Entity3D& operator()(std::size_t idx) const
                {
                    return container->getEntity(idx);
                }
 
                bool operator==(const ConstEntityAccessor& accessor) const
                {
                    return (container == accessor.container);
                }
 
                ConstEntityAccessor& operator=(const EntityAccessor& accessor)
                {
                    container = accessor.container;
                    return *this;
                }
 
              private:
                const Entity3DContainer* container;
            };
 
            class CDPL_CHEM_API EntityAccessor
            {
 
                friend class ConstEntityAccessor;
 
              public:
                EntityAccessor(Entity3DContainer* cntnr):
                    container(cntnr) {}
 
                Entity3D& operator()(std::size_t idx) const
                {
                    return container->getEntity(idx);
                }
 
                bool operator==(const EntityAccessor& accessor) const
                {
                    return (container == accessor.container);
                }
 
              private:
                Entity3DContainer* container;
            };
        };
    } // namespace Chem
} // namespace CDPL
 
#endif // CDPL_CHEM_ENTITYCONTAINER_HPP